Belt-drive mechanism.



J. F. HARRISON.

BELT DRIVE MEGHANISM.

APPLIGATION FILED 00T.12, 1905. RENEWED 00T. 1a, 1907.

907,045. Patented Dee. 15,1908.

2 SHEETS-SHEET 1.

WITNESSES.- INI/ENTOR J. F. HARRISON.

BELT DRIVE MEGHANISM.

APPLIOATION FILED 0012.12, 1905.- RBNEWED 00118, 1907.

907,045. Patented Dec. 15, 1908.

2 SHEETS-SHEET 2.

INI EN 'lOK i. STATES PATENT. OFFICE.

JOHN F. HARRISON, OF MILWAKEE, WISCONSIN, ASSIGNOR TO ALLIS-CHALMERS COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

BELT-DRIVE MECHAN ISM.

Bpecication o tLetters latent.

Patented Dec. 15, 1908.

ppleation led October 12, 1905, Serial No. 282,879. Benewed'October 18, 1907. Serial No. 398,031.

` citizen of the United states, residing n Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Belt-Drive Mechanism, of which the following is a specification.

This invention relates to certain improvements in a belt drive, and more particularly to those structures in which there is an element that has other movement besides rotation. q l

The utility of this device is a parent when appliedv to drive a bolter, sifler, Screener, sorting machine, or any other machine wherein quick rotary movementor shaking is desirable. l

Referring to the drawingsf-Figure 1 is a side elevation; and Fig. 2, a plan view ofan embodiment of the invention.

The membervl is exibly and yieldingly suspended by rods 2 hanging from a `support 3. i On the base 4 is an up-standing circular flange 5 which surrounds the spiral spring 6 serving to yieldingly center the roller 7. The roller 7 is mounted upon a pin 8 carried by a weighted arm 9. The arm is rigidly ,mounted on the shaft 10. The pin 8 ing out of line withthe shaft, makes this analogous to a crank structure.

At the opposite end of the member 1, the shaft 10 emerges and'has mounted thereon a second 4weighted arm 11 which carries intermediate its weighted end and the shaft 10 a crank pin '12. Loosely mounted Vonv this crank pin 12 isa spacing member l13, while fixed to the pin 'is the pulley 14. Driving the pulley 14 is the belt 15 which passes around the ide pulleys 16 and the drivin pulley 17. uhe drivingpulle 17 is mounte on the `drive shaft 18. Rods 19 serve to flexibly suspend one end of the guide su The .op osite end of tiie mounting coul be si arly supported. However, in this instance it is shown engaging the 'crankmounting is to eep theguide p leys spaced at a fixed distance from the pulley`14 and thereby take up -whip in the belt due to movements under slow In operation the mem r 1 receives rapid shaking vibrato .or Eyratory movements. This is' rought a ut y the movements of the shaft 10. Theshaft 10. is concentric pin 12. The pu y ose 4of this with the member 1that is, both have a come mon center line A. The crank pins 8 and 12- have a common center line B which is coincident with the center of gyration of th gyratory device 1, the weights 9 and 11 being proportioned to result in a balance structure about the crank pin center line. These crank pins 8 and 12 form means eccentric to the shaft 10.

In starting, while shaft 10 is driven slowly, the inertia of the parts willbe gradually overcome by the spiral spring 6, and shaft 10 while rotatingwill at lirst have very little lateral movement. Accordingly the pins 8 and 12 will describe orbits. This orbital movement of the pin 12 tends to vibrate or whip the belt 15 driving the pulley 14. This vibration is taken care of by the guide pulley 16 permanently spaced from the pin 12.

Aft-er the drive attains normal running speed, the pins 8 and 12 cease to describe orbits and the shaft 10 describes an orbitabout the axes of these pins, Whichthen becomes the running axis. This axis remains normally in a fixed position. The spiral spring 6 operates to maintain the running axis .in a fixed position. f

I-t is claimed and ters Patent,-

1. The combination of a cranked shaft freely and yieldably supported for lateral movement in any direction, the crank shaft having a bearing portionthereon near each end thereof, means to balance the shaft about the crank axis, a pulley on the crank, and a belt for the pulley.

2. The Acombination of a cranked shaft shaving a bearing portion thereon near each end thereof,lmeans to balance the shaft' about 'the'c'rank axis, a pulley on the crank, a' belt for the pulley, and' yieldably supported guidin means for the belt.

3. T e combination Iof a member freely rigid with the shaft, means nto balance the member about the eccentric element, and a ing the shaft, supporting means for the belt/ at,one point mounted on the shaft, and sepa# rate yieldable meansvfor mounting the belt supporting means at another point thereof.Y

6. The combination of a yieldably supported member, ashaft supported thereby, an eccentric means on the shaft, means to balance the member about the eccentric means, a belt for driving on the axis of the eccentric means, supporting means for the belt including guiding means mounted thereon, the belt supporting means at one point being mounted on the eccentric means, and a separate yeldable means for mounting the belt supported means at another point thereof. y

7. The combination with a body mounted for vibratory motion, of a rotary shaft carried by said body and provided With a driven pulley, a driving shaft ,supported independently of said vibratory body and provided With a driving pulley, a link supported at one end from said vibratory body, intermediate guide pulleys mounted for vibratory movements with the outer end of said link, a support for said intermediate pulleys and the outer end of said link'independent of the said vibratory body, and a driving belt running over said driving pulley, over said driven pulley, and oger said intermediate guide pulleys, substantially as described.l

8. The combination with a body mounted for vibratory motion, of a rotary shaft carried' by said body and provided with a driven pulley, a driving shaft supported independently of said vibratory body and provided With a driving pulley," a link having one end swiveled on the shaft which is earried by the vibratory body, intermediate guide pulleys mountedfor vibratory movements With the 'outer end of said link, a support for said intermediate pulley and the outer end of said link independent of said vibratory body, and a driving belt running supported at one end from said vibratory body, a pair of guide pulleys mounted for vibratory movements with the outer end of said link and arranged to guide said belt approximately in the planes of said drivin and driven pulleys, and a support for sai guide pulleys and the outer end of said link independent of said vibratory body, substantially as described.

In testimony whereof I aiiix my signature in presence of two Witnesses.

' JOHN F. HARRISON;

Witnesses:

, JOHN- DAY, Jr., Gr. F. DE WEIN. 

